Abstract: A magnetic resonance imaging system is configured to be selectively operated in a default mode and an emulation mode. Execution of machine executable instructions by a processor of the magnetic resonance imaging system causes the magnetic resonance imaging system to receive a selection signal selecting the emulation mode. The magnetic resonance imaging system switches from the default mode to the emulation mode. The magnetic resonance imaging system is operated in the emulation mode using the set of emulation control parameters. The emulated magnetic resonance imaging data is acquired from the imaging zone of the magnetic resonance imaging system.

Abstract: The invention relates to a magnetic resonance imaging system (100). The magnetic resonance imaging system (100) is configured to be selectively operated in a default mode and an emulation mode. Execution of machine executable instructions (290) by a processor (203) of the magnetic resonance imaging system (100) causes the magnetic resonance imaging system (100) to receive a selection signal selecting the emulation mode. The magnetic resonance imaging system (100) switches from the default mode to the emulation mode. The magnetic resonance imaging system (100) is operated in the emulation mode using the set of emulation control parameters (292). The emulated magnetic resonance imaging data (270) is acquired from the imaging zone (108) of the magnetic resonance imaging system (100).

Abstract: It is an object of the invention to improve MRI based treatment, especially MRI based radiotherapy. This object is achieved by a method for calibrating a magnetic resonance imaging (MRI) phantom having an expected geometry and comprising at least one MRI detectable part with a position within the geometry which is known with a geometric inaccuracy. The method comprises the following steps: step 1: placing the phantom at a predetermined location in a magnetic resonance system such that the MRI detectable part is within a symmetry plane of a gradient system of the magnetic resonance imaging system and; step 2: acquiring an MRI image of the MRI detectable part of the phantom by means of a first sequence, wherein the MRI image comprises multiple slices; step 3: determining the geometric inaccuracy of the MRI detectable part of the MRI phantom based on the position and the representation of the part in the MRI image.

Abstract: The invention relates to a device (34) for an MRI apparatus (14), especially an MRI apparatus (14) of an MR guided radiation therapy system (10), the device (34) comprising at least one MR imaging marker unit (72), wherein the marker unit (72) comprises an at least slightly MR-visible film (70) covering at least one conducting part of an electrical circuit loop (68) of the device (34). The invention further relates to the corresponding MRI apparatus (14) and MR guided radiation therapy system (10).

Abstract: It is an object of the invention to improve MRI based treatment, especially MRI based radiotherapy. This object is achieved by a method for calibrating a magnetic resonance imaging (MRI) phantom having an expected geometry and comprising at least one MRI detectable part with a position within the geometry which is known with a geometric inaccuracy. The method comprises the following steps: step 1: placing the phantom at a predetermined location in a magnetic resonance system such that the MRI detectable part is within a symmetry plane of a gradient system of the magnetic resonance imaging system and; step 2: acquiring an MRI image of the MRI detectable part of the phantom by means of a first sequence, wherein the MRI image comprises multiple slices; step 3: determining the geometric inaccuracy of the MRI detectable part of the MRI phantom based on the position and the representation of the part in the MRI image.